Ken,
Here's a thing from the ARBOR DAY site about roots.
Where Roots I can tell you what I know of maple
trees and their roots....
I've always understood their roots are very close to the surface, if not even some are out of it,
growing back in... I every so often chop off a bit of the top of the roots on ours when lawnmowing if I don't get the blade up fast enough!
I know that this is Girdling....
Girdling Kills Trees My first thoughts on this would be check your drainage by your
tree... Sounds like something under it, with water, either standing or running and it's causing the
tree to lean...
*the trunk leaning or the branche???*
Weezie